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Android开发系列二之窗口Activity的生命周期

Android开发系列一用按钮实现显示时间

设置窗口标题事件和在Activity之间跳转。

新建一个项目，新建两个Activity:MainActivity,TitleActivity ,然后再AnroidManifest.xml 中注册TitleActivity

AndroidManifest.xml内容如下

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.neil.ad02">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".TitleActivity"
android:label="@string/app_name">
</activity>
</application>
</manifest>

在MainActivity中的onCreate方法中

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Log.d("onCreate","onCreate Method is executed");
Button bt=(Button)findViewById(R.id.btTurnTitle);
bt.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
startActivity(new Intent(MainActivity.this,TitleActivity.class));
}
});
}

点击Button就触发TitleActivity的onCreate()->onStart()->onResume()方法

向activity_title.xml中添加一个Button，点击Button就改变app_name的值

TitleActivity中的代码

package com.neil.ad;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
/**
* Created by Neil on //.
*/
public class TitleActivity extends Activity{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_title);
Button bt=(Button)findViewById(R.id.btTitle);
bt.setOnClickListener((View.OnClickListener) this);
setTitle("窗口标题");
}
public void onClick_SetTitle(View view)
{
setTitle("新窗口标题");
setTitleColor();
}
//在窗口完全开始后调用该方法
@Override
protected void onPostCreate(Bundle savedInstanceState) {
Log.d("TitleActivity","onPostCreate");
super.onPostCreate(savedInstanceState);
}
@Override
protected void onTitleChanged(CharSequence title,int color)
{
super.onTitleChanged(title,color);
Log.d("TitleActivity","onTitleChanged_title"+title);
Log.d("TitleActivity","onTitleChanged_color"+color);
}
}

比较简单，就不多说了。如果大家有任何疑问欢迎给我留言，小编会及时回复大家的！